KABUL, Afghanistan -- A group of teenage girls is taking up fisticuffs to challenge Afghanistan's gender barriers. "Move, move, move," coach Saber Sharifi shouted as the 20-odd girls sparred recently.

In today’s fast-growing fitness industry, it’s easy to get caught up in the latest craze. For many of us, however, the goals are pretty simple: Feel good, look great and build strength. Boxing checks ...